Real-time projection based technique for tracking ferromagnetic devices
Felfoul O, Mathieu J, Beaudoin G, Martel S, Aboussouan E
cole Polytechnique de Montral (EPM)
A novel MR-tracking method specifically developed to locate the ferromagnetic core of an untethered microdevice is described. This microdevice aims at being propelled by magnetic gradients generated by a clinical MRI system for endovascular operations. The tracking method relies on the application of RF excitation signals tuned to the equipotential curves generated by the magnetic signature of the object being tracked. A proof of concept is achieved by comparing the MRI positioning data obtained with the proposed technique with those obtained by a camera. The average positioning error is found to be 1.2 mm.